<!DOCTYPE html>
<html lang="en">
<head>
    <!--<meta charset="UTF-8">-->
    <title>windows</title>
    <script>
        function fun(){
            setInterval("alert('HEllo')",10);
        }
    </script>
</head>
<body>
<button onclick="fun()">点击我</button>
</body>
</html>